GUI: how to make the user able to add or delete circles in an image.

Hi I'm trying to program a GUI that can detect circular objects in an image, and make the user able to add or delete circles manually. I'm using the circle finder program to detect circles in the image and that part works, but i'm having difficulty writing the part that makes the user able to add or delete circles manually. Your help will be much appreciated.

Answer 1

[Prashant Birajdar]

Dear,Jonas Fisker,

To add circle on image you need to hold the current plot. try the following code, it may work.

Image = imread('peppers.png'); % Read the image fig = figure('menubar','none','Position',[250 150 840 440]); % Create Figure panel = uipanel('Parent',fig); % Create panel in figure

imaxes = axes('Parent',panel,'Units',... 'Pixels'); % Create axis on panel to show image and your plot imshow(Image);

        [u v] = ginput(1); % Get input from user
        hold ('on');
        h1 = plot(u,v,'w+',u,v,'wo','markersize',10);
        [u(2) v(2)] = ginput(1); %Get input from user

        h1(3:4) = plot(u,v,'r+',u,v,'bo','markersize',10);
        delete (h1);

        A = diff(u);
        B = diff(v);
        R = hypot(A,B);
        P = [u(1)-R v(1)-R 2*R 2*R];

        h1 = imellipse(imaxes,P);
        position = wait(h1); % Wait for double click
        % store position for later plotting
        X = position(:,1);
        Y = position(:,2);
        delete(h1);

        h1 = plot(X,Y,'-r',X,Y,'--k');    
        hold ('off');

[Jonas Fisker]

Dear Prashant Birajdar

Thanks for the reply, it works great :) Do you know a way to select, move and delete circles, circles previously found by the circle finder program.

Answer 2

[Prashant Birajdar]

Dear,Jonas Fisker,

To add circle on image you need to hold the current plot. try the following code, it may work.

Image = imread('peppers.png'); % Read the image

fig = figure('menubar','none','Position',[250 150 840 440]); % Create Figure

panel = uipanel('Parent',fig); % Create panel in figure

imaxes = axes('Parent',panel,'Units',... 'Pixels'); % Create axis on panel to show image and your plot imshow(Image);

        [u v] = ginput(1); % Get input from user
        hold ('on');
        h1 = plot(u,v,'w+',u,v,'wo','markersize',10);
        [u(2) v(2)] = ginput(1); %Get input from user

        h1(3:4) = plot(u,v,'r+',u,v,'bo','markersize',10);
        delete (h1);

        A = diff(u);
        B = diff(v);
        R = hypot(A,B);
        P = [u(1)-R v(1)-R 2*R 2*R];

        h1 = imellipse(imaxes,P);
        position = wait(h1); % Wait for double click
        % store position for later plotting
        X = position(:,1);
        Y = position(:,2);
        delete(h1);

        h1 = plot(X,Y,'-r',X,Y,'--k');    
        hold ('off');